<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  
  <div id="app">
    <h2>Hello World</h2>
  </div>

  <script src="https://unpkg.com/vue@next"></script>
  <script>
    const why = {
      template: '<h2>Hello World</h2>'
    }

    const app = Vue.createApp(why);
    app.mount("#app")
  </script>

</body>
</html>